doolittle



2 Sheets-Sheet 1.

(No Model.)

J. PDOOLITTLE. BENDING MACHINE No. 589,161 v Patented Aug. 31, 1897.

' WITNESSES. 4

, IN VETN TOR.

JAM MMQ ATTORNEYS.

v 2 Sheets Sheet 2. J. F. DOOLITTL E. BENDING MACHINE.

Patented Aug. 31v, 1897.

fifim,

(No Model.)

WITNESSES.

' UNITED STATES PATENT Crimes.

JOHN F. DOOLITTLE, OF CLEVELAND OHIO, ASSIGNOR TO THE CLEVELAND PUNCHAND SHEAR WORKS COMPANY, OF SAME PLACE.

BENDlNG-MACHINE.

SPECIFICATION forming part of Letters Patent No. 589,167, dated August31, 1897. Application filed May 25, 1896. Serial No, 592,910. (Nomodel.)

To all-whom it wmy C07LC67'IL.

Be it known that I, JOHN F. DOOLITTLE, a citizen of the United States,and a resident of Cleveland, county of Cuyahoga, and State of Ohio, haveinvented certain new and useful Improvements in Be'nding-Machinespfwhich the following is a specification, the principle of the inventionbeing herein explained and the best mode in which I, have contemplatedto applying that principle so as to'distinguish it from otherinventions.

The annexed drawings and the following description set forth in detailone mechanical form embodying the invention, such detail constructionbeing but one of various mechanical forms in which the principle of theinvention may be used.

The object of my invention is to devise in a bending-machine a rollwhich can be used in bending stock of varying thickness, eliminatingthereby the necessity and inconvenience of changing rolls for eachdifferent thickness of stock; and a further object is to provide themachine with an adjustable guide 2 5 which will perform its functionwith less frictional resistance than do the guides at present used insuch machines.

To accomplish the first-named obj ect,I construct my roll of tworoll-sections, which are 0 keyed and slide upon the same shaft, aspacebeing left between the two sections, forming an annular slot, the widthof the said slot being regulated by means of screw-bolts passin g andthreaded through the one section and en 3 5 gaging the face of the othersection.

In order to reduce the frictional resistance occasioned by the contactof the stock with the guide, I provide the guide with a rotating face,the force of the contact being received 40 by ball-bearings, ashereinafter described.

In the annexed drawings, Figure I is a perspective view ofabending-machine provided with my improved rolls and guides. Fig. II

' is a view,partly in vertical section and partly 5 in elevation, of oneof the improved rolls.

Fig. III is an end elevation of one of my improved rolls. Fig.1V is anend elevation of the combination of the three rolls, showing theirarrangementji'tne machine and also showing the number and position ofthe guides,

together with a piece of angle-iron in the course of the operation ofthe machine. Fig.- Visa front elevation of the rolls, showing theposition of the rolls and guides and the relation of the slots when setfor bending flat stock. 5 5 Fig. VI is also a front elevation of therolls and guides and shows the relation of the slots when set forbending angle-iron. Fig. VII is a View, partly in vertical section andpartly in elevation, of my improved guide. Fig. VIII is a view, partlyin vertical section and partly in elevation, of the adjusting mechanismof the guide-rod.

The rolls A, B, and B are driven in the direction indicated by thearrows by the wellknown means of the pulleys and gears shown in Fig. I,the upper roll A having vertical adj ustment by means of pulleys E andE,worms C,whee1s D,and screws F in the usual manner.

The guide-rod g of the guide G extends through the housings H and II,sliding easily through housing II and having its adjusting mechanism atthe housing II, as hereinafter described.

The shaft J is turned down at its end, form-' ing thereby the shoulderj, against which the roll-section a of the roll is backed and keyed tothe shaft by means of feather j. The rollsection a, having the threescrew-bolts M passing therethrough and parallel to the shaft J andhaving screw threaded engagement therewith, is also mounted and keyed tothe said shaft in the same manner.

The end of the shaft is turned down and threaded to receive the loosewasher K and the nut L.

The variation in the width of the groove can be effected by turning thescrew-bolts M after loosening up the nut L.

The guide G is composed of the guide-rod g, extending, as before stated,through both housings H and H, and is enlarged to a suitable diameter atthe guide end, as shown in Fig. VII. The inner or primary face 9 isconstructed of a hardened-steel disk and is 5 formed with a ball-race 9around and near the edge of its face. The'outer or secondary face 9 isalso constructed of a hardened-steel disk and has a similar ball-race 9formed as in the primary face 9 and is further pivoted I00 to theguide-rod g by means of the screw g about which the disk g freelyrotates. A jam-block g isjainmed down it pen the threads of the screw bymeans of the set-screw g to prevent it from backing out. Balls areplaced in the races and form the bearing for thrusts on the disk in thedirection of its axis.

The opposite end of the guide-rod has threaded engagement with thethimble 71, which has rotating bearing in the housing II and, beingformed with the flange 7L4, limits the lateral movement of the guide-rodtoward the housing II. A washer h is keyed upon the opposite side of thehousing II and is provided with holes 7L2 in its periphery for receivinga bar, by means of which the thimble is turned, thus laterally adjustingthe guide-rod and its attached guide. Two such guides are provided inthe machine, as shown in Fig. IV, so that the machine may be reversedand the stock sent in the other direction. I

Rolls may be similarly constructed having more than two sections, sothat such stock as channel-bars and I-beams may be bent, the number ofsections and position of the slots depending upon the form of the stock.

\Vhen fiatiron is bent, a washer N of the required thickness is insertedbetween the sections of the roll and a washer N inserted between theshoulder] and the inner section a, Fig. V.

In bending bars of irregular or unsymmetrical cross-section, such bars,by virtue of the inequality of the internal strains produced in thebending operation, have a tendency to warp on issuing from the rolls,and would so warp were not the guide G provided for such a contingency.

The direction in which the bars will warp may be usually determined bythe form of the cross-section, but if such cross-section does not givethe necessary data for such determination the direction of warp may bedetermined empirically. In either case, when said direction is known thebars are so fed into the rolls that the warping tendency will always betoward the guide, which receives the consequent thrust and performs theoperation of equilibrating the internal in equalities, so that the ringremains flat on completion.

Other modes of applying the principle of my invention may be used forthe mode herein explained. Change may therefore be made as regards themechanism thus disclosed, provided the principles of constructionsetforth respectively in the following claims are employed.

I therefore particularly point out and distinctly claim as myinvention 1. In a bending-machine, a roll consisting of the combinationwith two elemental rollsections, of a shaft adapted to mount said rollat its end, and provided with means adapted to limit one of saidsections in its motion in the direction of the axis of said shaft, theother section provided with means adapted to vary the distance betweensaid two sections, said shaft provided with means for limiting theaction of said varying means, whereby said two sections are fixedrelatively to each other, substantially as set forth.

2. In a bending-machine, a roll consisting of the combination with twoelemental rollsections, of a shaft adapted to mount said roll at its endand provided with means adapted to limit one of said sections in itsmotion in the direction of theaxis of said shaft, the other sectionprovided with screwbolts passing longitudinally therethrough, havingscrew-threaded engagement therewith and adapted to vary the distancebetween said two sections, said shaft provided with means for limitingthe action of said bolts, whereby the said two sections are fixedrelatively to each other, substantially as set forth.

3. In a bending-machine, a roll consisting of the combination with twoelemental rollsections, of a shaft adapted to mount said roll at itsend, said shaft provided with a shoulder adapted to limit one of saidsections in its motion in the direction of the axis of the shaft, theother section provided with means adapted to vary the distance betweensaid two sections, said shaft provided with means for limiting theaction of said varying means, whereby said two sections are fixedrelatively to each other, substantially as set forth.

4. A roll consisting of the combination with two elementalroll-sections, of a shaft formed with a shoulder and provided at its endwith a nut and washer, said roll-sections being located between saidshoulder and washer, and provided with means adapted to separate saidsections, whereby they are caused to bear respectively against saidshoulder and washer, whereby they are relatively fixed, substantially asset forth.

5. A roll consisting of the combination of roll-section a, roll-sectiona, shaft J provided with a shoulderj and formed with a threaded portionat its end, washer K, nut I and means for separating said sections,whereby they are caused to bear respectively against said shoulder andwasher and whereby they are relatively fixed, substantially as setforth.

6. A roll consisting, of the combination of roll-sections a and a, shaftJ provided with a shoulderj and a threaded end, a washer K, nut I, andscrew-bolts M, substantially as set forth.

7. A roll consisting of the combination of roll-sections a and ct, shaft.1 provided with a shoulderj and a threaded end, a washer K, a nut I,screw-bolts M and a washer N, substantially as set forth.

8. In a guide for guiding stock issuing from rolls, the combination witha uide-rod laterally adjustable, a guidc-bodyrigidly attached to saidrod, of a rotatable disk pivoted upon In testimony that I claim the Iforegoing to said guide-body, the face of the guide-body be myinventionI have hereunto set my hand and inner face of the rotatable disk beingthis 14th day of May, A. D. 1896.

provided with ball-races, and balls adapted J. F. DOOLITTLE. 5 to bearin said races and having contact with WVitnesses:

said rotatable disk and guide-body, substan- I A. E. MERKEL,

tially as set forth. DAVID B. DAVIES.

